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EP2130749B1 - Track unit for moving a ground work vehicle - Google Patents

Track unit for moving a ground work vehicle Download PDF

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Publication number
EP2130749B1
EP2130749B1 EP09160888.5A EP09160888A EP2130749B1 EP 2130749 B1 EP2130749 B1 EP 2130749B1 EP 09160888 A EP09160888 A EP 09160888A EP 2130749 B1 EP2130749 B1 EP 2130749B1
Authority
EP
European Patent Office
Prior art keywords
track unit
longitudinal member
ground
elastic elements
axles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09160888.5A
Other languages
German (de)
French (fr)
Other versions
EP2130749A8 (en
EP2130749A1 (en
Inventor
Riccardo Canossa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Camso Manufacturing Italy SRL
Original Assignee
Tidue Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tidue Srl filed Critical Tidue Srl
Publication of EP2130749A1 publication Critical patent/EP2130749A1/en
Publication of EP2130749A8 publication Critical patent/EP2130749A8/en
Application granted granted Critical
Publication of EP2130749B1 publication Critical patent/EP2130749B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/104—Suspension devices for wheels, rollers, bogies or frames
    • B62D55/108—Suspension devices for wheels, rollers, bogies or frames with mechanical springs, e.g. torsion bars
    • B62D55/1086—Rubber springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/10—Bogies; Frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/12—Arrangement, location, or adaptation of driving sprockets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/14—Arrangement, location, or adaptation of rollers

Definitions

  • the present invention relates to a track unit for moving a ground work vehicle.
  • such supporting structure is monolithic, but there are also track systems in which the structure proper is divided into two portions connected by means of elastic coupling means in order to provide users with a certain comfort.
  • US-A-5 273 126 discloses a track assembly including a sub-frame supporting ground rollers and rear and front idlers.
  • the sub-frame is supported from a vehicle body frame by parallel front and rear swing links, and a vertically extending air-spring suspension unit connected between the vehicle body frame and the sub-frame in a central position between the front and rear swing links.
  • US 2007/0107950 A discloses a suspension system for a vehicle track assembly having a lower front idler wheel, a lower rear idler wheel, a plurality of lower support wheels arranged between the idler wheels, an upper rear drive wheel, and an endless belt mounted aroung the wheels.
  • the plurality of lower support wheels are mounted on a lower support link that is movable with respect to the vehicle frame.
  • the suspension system comprises a front suspension likage pivoted between the vehicle frame and the front idler wheel, and a rear suspension linkage pivoted between the vehicle from and the rear idler wheel.
  • the front suspension linkage has a rear end which is coupled to the lower support link through a front resilient member (air bag), and the rear suspension linkage has a front end which is coupled to the lower support link through a rear resilient member (air bag).
  • the upper rear drive wheel is mounted independently to the lower front and rear idler wheels.
  • the background art provides embodiments of such track units that are not entirely satisfactory, and therefore the aim of the present invention is to provide a track unit that has great simplicity and maximum functional efficiency.
  • the reference numeral 1 generally designates the track unit according to the invention, which comprises a supporting structure divided into two portions.
  • the first upper portion of the structure comprises two strong profiles 2 and 3, which are monolithically connected, with the corresponding plates 2a, 3a, such upper portion supporting the driving wheel 4 that moves the track 5.
  • the second lower portion of the structure comprises the longitudinal member 6 with the monolithically connected plates 6a, 6b, and such monolithic portion supports with parallel axles the front and rear guiding wheels of the track 5, and more precisely the front pair of coaxial wheels 7a, 7b and the rear pair of coaxial wheels 8a, 8b.
  • Such second portion 6 further supports the resting rollers that are mounted in pairs on four axles: the reference numerals 9a, 9b designate the rollers mounted on the first axle, the numerals 10a, 10b designate the rollers mounted on the second axle, and the numerals 11 and 12 designate two rollers mounted respectively on the third axle and on the fourth axle.
  • the portion of the track 5 that runs between the guiding wheels 7a, 7b and 8a, 8b, and at the resting rollers mounted on the four intermediate axles, is the one that makes contact with the ground.
  • Two elastic elements are interposed between the two monolithic structure portions described, are arranged respectively proximate to the front and rear ends and are formed by the monolithic blocks 13 and 14, which are made of elastic material and are coupled to the longitudinal member 6 and to the plates 2a, 3a, which are shown in Figure 2 , whereas in Figure 1 they are hidden behind the fairing 15.
  • the front linkage is articulated in an intermediate position by means of the pivot 16a, and is pivoted to the upper and lower portions of the structure respectively by means of the pivots 16b, 16c;
  • the rear linkage 17 is hinged to the upper and lower portions of the structure respectively by means of the pivots 17a, 17b, and also has the function of contrasting any longitudinal thrusts that are parallel to the ground and are generated on the lower portion and to which the elastic elements 13 and 14 are unable to provide any contrast.
  • the two front axles i.e., those that support the resting rollers 9a, 9b and 10a, 10b, respectively, are connected by the spherical joint provided with a rocker, generally designated by the reference numeral 18 and shown in particular in Figure 3 , which is fixed to the lower portion of the structure by means of the threaded stems 18a, 18b, and a similar spherical joint, designated by the reference numeral 19, is interposed between the third axle and the fourth axle.
  • a rocker generally designated by the reference numeral 18 and shown in particular in Figure 3
  • a similar spherical joint designated by the reference numeral 19
  • such spherical joints are of the elastic type.
  • Figure 4 illustrates a further embodiment of the track unit according to the invention, in which between the upper portion of the structure that comprises the profiles 2 and 3 with the corresponding plates 2a, 3a and the lower portion that comprises the longitudinal member 6 with the corresponding plates 6a, 6b elastic elements are interposed, generally designated by the reference numerals 20 and 21, which are shaped so as to provide contrast to longitudinal thrusts that are parallel to the ground and might be applied to the lower portion of the structure.
  • the elastic element 20 comprises two components 20a, 20b, which are coupled respectively to the plate 2a of the upper portion of the structure and to the longitudinal member 6 of the lower portion, and likewise the elastic element 21 comprises two components 21a, 21b, which are coupled respectively to the plate 3a and to the longitudinal member 6, and the surface in mutual contact of said components, designated respectively by the reference numerals 20c, 21c, is V-shaped; in this manner, it is possible to generate a reaction for contrasting the longitudinal thrusts that are parallel to the ground as mentioned above, and it is barely worth noting that the surface in mutual contact of the two components can be contoured according to several shapes that are different from the one shown.
  • the means adapted to ensure the coplanar arrangement of the two portions of the structure are no longer involved in contrasting said thrusts, and therefore are shaped according to the two linkages 22, 23, which are articulated in an intermediate position by means of the pivots 22a, 23a and are hinged on the upper portion of the structure by means of the pivots 22b, 23b, respectively, and on the lower portion by means of the pivots 22c, 23c, respectively.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Handcart (AREA)
  • Guiding Agricultural Machines (AREA)
  • Tires In General (AREA)
  • Soil Working Implements (AREA)

Description

  • The present invention relates to a track unit for moving a ground work vehicle.
  • It is known that several types of ground work vehicle, and we are referring for example to machines that work in the field of agriculture or of earth-moving machines or machines for geophysical research, are provided, instead of the wheels of at least one axle, with track units that comprise a structure for supporting a driving wheel that moves a track in contact with guiding wheels and resting rollers associated with said structure.
  • In certain types of track units, such supporting structure is monolithic, but there are also track systems in which the structure proper is divided into two portions connected by means of elastic coupling means in order to provide users with a certain comfort.
  • US-A-5 273 126 discloses a track assembly including a sub-frame supporting ground rollers and rear and front idlers. The sub-frame is supported from a vehicle body frame by parallel front and rear swing links, and a vertically extending air-spring suspension unit connected between the vehicle body frame and the sub-frame in a central position between the front and rear swing links.
  • US 2007/0107950 A discloses a suspension system for a vehicle track assembly having a lower front idler wheel, a lower rear idler wheel, a plurality of lower support wheels arranged between the idler wheels, an upper rear drive wheel, and an endless belt mounted aroung the wheels. The plurality of lower support wheels are mounted on a lower support link that is movable with respect to the vehicle frame. The suspension system comprises a front suspension likage pivoted between the vehicle frame and the front idler wheel, and a rear suspension linkage pivoted between the vehicle from and the rear idler wheel. The front suspension linkage has a rear end which is coupled to the lower support link through a front resilient member (air bag), and the rear suspension linkage has a front end which is coupled to the lower support link through a rear resilient member (air bag). The upper rear drive wheel is mounted independently to the lower front and rear idler wheels.
  • However, the background art provides embodiments of such track units that are not entirely satisfactory, and therefore the aim of the present invention is to provide a track unit that has great simplicity and maximum functional efficiency.
  • This aim is achieved by a track unit for moving a ground work vehicle, according to the invention, characterized in that it comprises the features given in the appended claims.
  • Further characteristics and advantages of the track unit according to the invention will become better apparent from the description of two preferred but not exclusive embodiments thereof, illustrated by way of non-limiting example in the accompanying drawings, wherein:
    • Figure 1 is a perspective view of the track unit according to the invention, with the track shown in dot-and-dash lines;
    • Figure 2 is a side view of the track unit according to the invention, with a fairing and the track removed for reasons of illustration;
    • Figure 3 is a view of a detail of Figure 1, with a pair of rollers shown in dot-and-dash lines;
    • Figure 4 is a side view similar to Figure 2, according to another embodiment.
  • With reference to the Figures 1, 2, 3, the reference numeral 1 generally designates the track unit according to the invention, which comprises a supporting structure divided into two portions.
  • The first upper portion of the structure comprises two strong profiles 2 and 3, which are monolithically connected, with the corresponding plates 2a, 3a, such upper portion supporting the driving wheel 4 that moves the track 5.
  • The second lower portion of the structure comprises the longitudinal member 6 with the monolithically connected plates 6a, 6b, and such monolithic portion supports with parallel axles the front and rear guiding wheels of the track 5, and more precisely the front pair of coaxial wheels 7a, 7b and the rear pair of coaxial wheels 8a, 8b.
  • Such second portion 6 further supports the resting rollers that are mounted in pairs on four axles: the reference numerals 9a, 9b designate the rollers mounted on the first axle, the numerals 10a, 10b designate the rollers mounted on the second axle, and the numerals 11 and 12 designate two rollers mounted respectively on the third axle and on the fourth axle.
  • The portion of the track 5 that runs between the guiding wheels 7a, 7b and 8a, 8b, and at the resting rollers mounted on the four intermediate axles, is the one that makes contact with the ground.
  • Two elastic elements are interposed between the two monolithic structure portions described, are arranged respectively proximate to the front and rear ends and are formed by the monolithic blocks 13 and 14, which are made of elastic material and are coupled to the longitudinal member 6 and to the plates 2a, 3a, which are shown in Figure 2, whereas in Figure 1 they are hidden behind the fairing 15.
  • Moreover, there are means adapted to ensure a coplanar arrangement of the upper and lower portions of the structure, such means comprising two linkages arranged respectively proximate to the front and rear ends and pivoted on said portions.
  • The front linkage, generally designated by the reference numeral 16, is articulated in an intermediate position by means of the pivot 16a, and is pivoted to the upper and lower portions of the structure respectively by means of the pivots 16b, 16c; the rear linkage 17 is hinged to the upper and lower portions of the structure respectively by means of the pivots 17a, 17b, and also has the function of contrasting any longitudinal thrusts that are parallel to the ground and are generated on the lower portion and to which the elastic elements 13 and 14 are unable to provide any contrast.
  • The two front axles, i.e., those that support the resting rollers 9a, 9b and 10a, 10b, respectively, are connected by the spherical joint provided with a rocker, generally designated by the reference numeral 18 and shown in particular in Figure 3, which is fixed to the lower portion of the structure by means of the threaded stems 18a, 18b, and a similar spherical joint, designated by the reference numeral 19, is interposed between the third axle and the fourth axle.
  • Advantageously, such spherical joints are of the elastic type.
  • Figure 4 illustrates a further embodiment of the track unit according to the invention, in which between the upper portion of the structure that comprises the profiles 2 and 3 with the corresponding plates 2a, 3a and the lower portion that comprises the longitudinal member 6 with the corresponding plates 6a, 6b elastic elements are interposed, generally designated by the reference numerals 20 and 21, which are shaped so as to provide contrast to longitudinal thrusts that are parallel to the ground and might be applied to the lower portion of the structure.
  • The elastic element 20 comprises two components 20a, 20b, which are coupled respectively to the plate 2a of the upper portion of the structure and to the longitudinal member 6 of the lower portion, and likewise the elastic element 21 comprises two components 21a, 21b, which are coupled respectively to the plate 3a and to the longitudinal member 6, and the surface in mutual contact of said components, designated respectively by the reference numerals 20c, 21c, is V-shaped; in this manner, it is possible to generate a reaction for contrasting the longitudinal thrusts that are parallel to the ground as mentioned above, and it is barely worth noting that the surface in mutual contact of the two components can be contoured according to several shapes that are different from the one shown.
  • Of course, the means adapted to ensure the coplanar arrangement of the two portions of the structure are no longer involved in contrasting said thrusts, and therefore are shaped according to the two linkages 22, 23, which are articulated in an intermediate position by means of the pivots 22a, 23a and are hinged on the upper portion of the structure by means of the pivots 22b, 23b, respectively, and on the lower portion by means of the pivots 22c, 23c, respectively.
  • The described invention is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; all the details may further be replaced with other technically equivalent elements.
  • The disclosures in Italian Patent Application No. MN2008A000012 from which this application claims priority are incorporated herein by reference.
  • Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims (8)

  1. A track unit (1) for moving a ground work vehicle, comprising a structure (2,3,6) for supporting a driving wheel (4) which is adapted to transmit motion to a track (5) that has a portion, at two pairs of coaxial guiding wheels (7a-b; 8a-b) at the end and at intermediate resting rollers (9-12), which is in contact with the ground, the track unit (1) further comprising a monolithic upper portion of said structure that supports the driving wheel (4), said monolithic upper portion comprising two profiles (2,3) which are monolithically connected, and which upper portion supports the driving wheel (4) and which extend respectively forwardly and rearwardly from said driving wheel (4), and the track unit (1) further comprising a monolithic lower portion comprising a longitudinal member (6) that supports the two pairs of coaxial guiding wheels (7a-b; 8a-b) with parallel axles and the resting rollers (9-12), means adapted to ensure a coplanar arrangement of the upper and lower portions of the structure being also provided and which comprises two linkages (16,17;22,23) arranged respectively proximate to the front and rear ends and pivoted respectively on said upper and lower portions, the track unit (1) characterized by two elastic elements (13,14;20,21) located respectively proximate to the front and rear ends and interposed between said two profiles (2,3) and said longitudinal member (6), and at least one (16;22,23) of said linkages being articulated in an intermediate position by means of an intermediate pivot (16a;22a,23a) and is pivoted to the upper and lower portions by means of the pivots (16b,16c;22b,22c,23b,23c) for pivoting the at least one linkage (16;22,23) respective to the two profiles (2,3) and longitudinal member (6) respectively.
  2. The track unit (1) according to claim 1, characterized in that said two linkages (16,17) have such a shape as to contrast longitudinal thrusts that are parallel to the ground and are applied to said longitudinal member (6), the two elastic elements (13,14) being provided so as to be irrelevant in this respect.
  3. The track unit (1) according to claim 2, characterized in that the front linkage (16) of said linkages being articulated in an intermediate position by means of said intermediate pivot (16a), the two elastic elements being provided by means of monolithic blocks (13,14) made of elastic material.
  4. The track unit (1) according to claim 1, characterized in that the two elastic elements (20,21) have such a shape as to provide the retention of longitudinal thrusts that are parallel to the ground and are applied to the longitudinal member (6) of the structure.
  5. The track unit (1) according to claim 4, characterized in that at least one of the elastic elements is shaped according to two components (20a,20b;21a, 21b) which are coupled respectively to the two profiles (2,3) and longitudinal member (6) of the structure, and are contoured at the surface in mutual contact so as to create a reaction contrasting longitudinal thrusts that are parallel to the ground on said lower portion, both of said two linkages (22,23) being articulated in an intermediate position and being hinged at the front and rear ends of said two profiles (2,3) and longitudinal member (6).
  6. The track unit (1) according to claim 5, characterized in that the two elastic elements are each shaped according to two components that are coupled respectively to the upper and lower portions of the structure and are V-shaped at the surface (20c,21 c) in mutual contact.
  7. The track unit (1) according to one or more of the preceding claims, characterized in that at least one pair of axles is provided for supporting the resting rollers (9,12), a spherical joint (18,19) being provided which is interposed between the axles of the pair and the longitudinal member (6) of the structure.
  8. The track unit (1) according to one or more of the preceding claims, characterized in that at least one pair of axles is provided for supporting the resting rollers (9,12), an elastic spherical joint being provided which is interposed between the axles of the pair and the longitudinal member (6) of the structure.
EP09160888.5A 2008-06-05 2009-05-22 Track unit for moving a ground work vehicle Active EP2130749B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000012A ITMN20080012A1 (en) 2008-06-05 2008-06-05 TRACKING MACHINE FOR WORKING MACHINE ON SOIL

Publications (3)

Publication Number Publication Date
EP2130749A1 EP2130749A1 (en) 2009-12-09
EP2130749A8 EP2130749A8 (en) 2010-03-24
EP2130749B1 true EP2130749B1 (en) 2013-07-31

Family

ID=40301917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09160888.5A Active EP2130749B1 (en) 2008-06-05 2009-05-22 Track unit for moving a ground work vehicle

Country Status (4)

Country Link
US (1) US8118374B2 (en)
EP (1) EP2130749B1 (en)
CA (1) CA2668234A1 (en)
IT (1) ITMN20080012A1 (en)

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WO2013001845A1 (en) * 2011-06-30 2013-01-03 ヤンマー株式会社 Working vehicle
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WO2015038913A1 (en) * 2013-09-13 2015-03-19 Mtd Products Inc Drive sprocket for a tracked vehicle
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US11618515B2 (en) 2019-04-09 2023-04-04 Cnh Industrial America Llc Suspension system for a track-driven work vehicle with tandem rear idler/roller
US11753093B2 (en) 2019-04-09 2023-09-12 Cnh Industrial America Llc Suspension system for a track-driven work vehicle with pivoting roller wheel assemblies
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Also Published As

Publication number Publication date
EP2130749A8 (en) 2010-03-24
ITMN20080012A1 (en) 2009-12-06
US20090278403A1 (en) 2009-11-12
EP2130749A1 (en) 2009-12-09
CA2668234A1 (en) 2009-12-05
US8118374B2 (en) 2012-02-21

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